The Chassezac (; ) is an long river in the Lozère, Gard and Ardèche departments in southern France. It is a right tributary of the Ardèche. Its source is in the commune of Saint-Frézal-d'Albuges, northeast of Les Chazeaux, the main hamlet in the commune. It flows generally southeast and flows into the Ardèche at Saint-Alban-Auriolles, east of the village itself.
The following list is ordered from source to mouth :